Implement updateViaCache flag and no-cache by default for main service worker scripts

third_party/WebKit/Source/core/html/HTMLLinkElement.h

Index: third_party/WebKit/Source/core/html/HTMLLinkElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLLinkElement.h b/third_party/WebKit/Source/core/html/HTMLLinkElement.h
index c9aa13cfc823dac8339060643d7dae23f205308c..c315d3fe5ff70d95e4b43995ca5ce83ea2c25779 100644
--- a/third_party/WebKit/Source/core/html/HTMLLinkElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLLinkElement.h
@@ -37,6 +37,7 @@
 #include "core/loader/LinkLoaderClient.h"
 #include "platform/WebTaskRunner.h"
 #include "platform/bindings/TraceWrapperMember.h"
+#include "public/platform/modules/serviceworker/WebServiceWorkerUpdateViaCache.h"
 
 namespace blink {
 
@@ -63,6 +64,9 @@ class CORE_EXPORT HTMLLinkElement final : public HTMLElement,
     return static_cast<DOMTokenList&>(*rel_list_);
   }
   String Scope() const { return scope_; }
+  WebServiceWorkerUpdateViaCache UpdateViaCache() const {
+    return update_via_cache_;
+  }
 
   const AtomicString& GetType() const;
 
@@ -150,6 +154,8 @@ class CORE_EXPORT HTMLLinkElement final : public HTMLElement,
   void DidSendDOMContentLoadedForLinkPrerender() override;
   RefPtr<WebTaskRunner> GetLoadingTaskRunner() override;
 
+  void ParseUpdateViaCacheAttribute();
+
   Member<LinkResource> link_;
   Member<LinkLoader> link_loader_;
 
@@ -162,6 +168,7 @@ class CORE_EXPORT HTMLLinkElement final : public HTMLElement,
   TraceWrapperMember<RelList> rel_list_;
   LinkRelAttribute rel_attribute_;
   String scope_;
+  WebServiceWorkerUpdateViaCache update_via_cache_;
 
   bool created_by_parser_;
 };